如何在带引号的正则(qr)表达式中添加修饰符 [英] How to add a modifier to a quoted regular (qr) expression

问题描述

是否有一种简单的方法可以将正则表达式修饰符(例如"i")添加到带引号的正则表达式中?例如:

Is there an easy way to add regex modifiers such as 'i' to a quoted regular expression? For example:

$pat = qr/F(o+)B(a+)r/;
$newpat = $pat . 'i'; # This doesn't work

我唯一想到的方法是转到print "$pat\n"并返回(?-xism:F(o+)B(a+)r)，并尝试用替换项删除?-xism:中的'i'

The only way I can think of is to print "$pat\n" and get back (?-xism:F(o+)B(a+)r) and try to remove the 'i' in ?-xism: with a substitution

推荐答案

您不能将标志放在已经具有的qr结果中，因为它受到了保护.而是使用此:

You cannot put the flag inside the result of qr that you already have, because it’s protected. Instead, use this:

$pat = qr/F(o+)B(a+)r/i;

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